Ditto, ditto, ditto!!!! If you have exhausted contacting all relevant agencies, such as police, animal control, shelters, newspaper ads, posters, etc. KEEP THE DOG!!!! PLEASE do not release the dog to a shelter. It's future would be uncertain, at best. It sounds like providence to me that you two met. As they say, "God works in mysterious ways" Sounds like this may have been a match made in heaven. Good luck, and KEEP THE DOG!